charpentieb



(No Model.)

P. A. GHARPENTIER.

ELECTRIC CONDUCTOR FOR FIRE ALARMS. No. 259,816. Patented June 20,1882.

ATTORNEYS.

UNITED STATES PATENT OFFICEQ IAULIN A. OHARPENIIER, OF PARIS, FRANCE.

ELECTRIC CONDUCTOR FOR FIRE-ALARMS.

SPECIFICATION forming part of Letters Patent No. 259,816, dated June 20,1882.

Application filed December 5, 1881. (No model.) Patented in France July1, 1880, No. 137,558.

I 0 all whom it may concern Be it known that I, PAULIN AMEDEE CHAR-PENTIER, formerly watch-maker to the French navy, at Paris, France, haveinvented an Electric Conductor Used as a Fire-Alarm; and I do herebydeclare that the following isa full, clear, and exact description of thesame.

My invention refers to an electric conductor to be used as a fire-alarm.The electric current passes in this conductor when the several wires ofwhich itis composed are connected by the soldering, which is caused byan increase of temperature.

The rope is composed, as shown in the drawing, of two copper wires, eachof which is covered with silk steeped in paraftine or in any otherimpermeable matter which has also the property of facilitating thesoldering. To these two wires I join a third wire, composed of tin or ofany other metal capable of being melted at a suitable temperature and ofsoldering together the wire round which it is wound. These three wiresare covered with cotton or silken thread, which is also steeped inparaffine. WVhen the wires are placed in damp places they should becovered with a coating of guttapercha or other equivalent material.

I reserve the right of using all kinds of metals or alloys which may benecessary according to the degree of fusibility which it is desired toobtain, and also to employ any suitable number of elementary wirescomposing the rope.

In practical use each of my copper wires is connected with one pole of abattery or other source of electricity, so that when the circuit isclosed by the fusion of the tin and the consequent soldering together ofthe copper wires an alarm which is arranged in the circuit will beinstantly sounded.

I am aware that two copper wines have been used in connection with onepole of a battery; but the insulating material, when burned, does notallow the contact of the wires and the closing of the circuit, becausein its burned state it is acarbonized mixture which militates against anefficient electrical contact. 0n the other hand the melting of my tinsolders the two wires together and insures a perfect contact.

IVhat I claim as new and of my invention 1s- An electric conductor foralarms, consisting of two insulated copper wires and an intermediatewire of tin or other easily-fusible metal, whereby the fusing of the tinwire will solder together the two copper wires connected with the twopoles of a battery, thereby close the electric circuit and promptlysound an alarm in said circuit, as described.

PAULIN AMEDEE CIIARPENTIER.

Witnesses R0121. M. HOOPER, J EAN BAPTIST ROLLAND.

